Effect of low level substitution of Sr–Ba on transport and magnetic behaviour of La0·67Ca0·33MnO3

. In this paper we report the investigation of transition metal oxide compound, La 0·67 Ca 0·25 Sr 0·04 Ba 0·04 MnO 3 (LCSBMO), along with La 0·67 Ca 0·33 MnO 3 (LCMO), synthesized by sol–gel route under identical conditions. The effect of simultaneous low level substitution of large size ions such...

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Bibliographic Details
Published in:Bulletin of materials science 2011-02, Vol.34 (1), p.121-124
Main Authors: MUNIRATHINAM, B, KRISHNAIAH, M, RAJA, M MANIVEL, ARUMUGAM, S, PORSEZIAN, K
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Electrical resistivity
Electron transport
Engineering
Ferromagnetism
Lattice parameters
Low level
Magnetic permeability
Magnetic properties
Materials Science
Polarons
Sol-gel processes
Substitutes
Temperature dependence
Transition metal oxides
Transition temperature
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Summary:. In this paper we report the investigation of transition metal oxide compound, La 0·67 Ca 0·25 Sr 0·04 Ba 0·04 MnO 3 (LCSBMO), along with La 0·67 Ca 0·33 MnO 3 (LCMO), synthesized by sol–gel route under identical conditions. The effect of simultaneous low level substitution of large size ions such as Sr 2+ and Ba 2 +  for Ca 2 +  ions on the electronic transport and magnetic susceptibility properties are analysed and compared apart from microstructure and lattice parameters. The temperature dependent electrical transport of the polycrystalline pellets of LCSBMO and LCMO when obeying the well studied law, for T    T MI , the polaron activation energy is found to differ by about 11%. In addition, the temperature dependent a.c. magnetic susceptibility study of the compounds shows a shift of about 6% in the paramagnetic to ferromagnetic transition temperature (285 K for LCSBMO and 270 K for LCMO).
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-011-0047-y